This is a really nice start! Love all the character art... the titlescreen, sprites and portraits all look great. She's got a nice design too. Music fits very well, I like the dreamy atmosphere it gives.
The story seems like it has a lot of potential, though the demo is a little too short for me to give a strong opinion. But so far so good! The description is certainly intriguing. I'll have to check back when it's finished!
I think weckar already mentioned the puzzle... the piece overlapping the mirror on the bottom was a little annoying, but not a deal breaker. One small visual bug I noticed is that if you started a dialogue while walking, the sprite would keep playing the walking animation. (At least on the quizzes, I didn't go out of my way to see if this happened elsewhere)
Looking forward to the finished game!